US4741743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding wheel with combination of fused and sintered abrasive grits
Assignee: Saint Gobain Abrasives Inc
•
Filing: 1985-08-19
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Granted: 1988-05-03
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Expires: 2005-08-19
Abstract
Abstract A combination of fused alumina grits with sintered gel alumina abrasive grits is shown to be more effective than either abrasive alone in cutting steel bars with bonded abrasive wheels at intermediate cutting speeds.
Inventors
- 👤 Kesh S. Narayanan
- 👤 Suresh S. Vagarali
- 👤 Brian E. Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:00
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/02; B24D3/20; B24D3/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A grinding wheel especially suitable for intermediate grinding speeds comprising abrasive grits bonded by an organic polymer bond in which the abrasive grits are a mixture of (1) cofused alumina-zirconia, containing 20 to 55% zirconia, and, (2) a sintered aluminous gel abrasive having a hardness of at least 13 on the Knoop scale, the ratio of (1) to (2) being in the range of from 30 to 70 to 70 to 30, by volume.
Claim 2
Dependent Claim
74 words
A grinding wheel especially suitable for intermediate grinding speeds comprising abrasive grits bonded by an organic polymer bond in which the abrasive grits are a mixture of (1) cofused alumina-zirconia, containing 20 to 55% zirconia, and, (2) a sintered aluminous gel abrasive having a hardness of at least 13 on the Knoop scale, the ratio of (1) to (2) being in the range of from 30 to 70 to 70 to 30, by volume.
Claim 3
Dependent Claim
18 words
A grinding wheel as in claim 1 in which the abrasive (1) contains from 35 to 50% zirconia.
Claim 4
Dependent Claim
16 words
A grinding wheel as in claim 1 in which the abrasive (2) is essentially pure alumina.
Claim 5
Dependent Claim
19 words
A grinding wheel as in claim 1 in which abrasive is alumina with a minor amount of magnesia spinel.
Claim 6
Dependent Claim
15 words
A grinding wheel as in claim 1 in which the resin is a phenolic resin.
Claim 7
Dependent Claim
42 words
A grinding wheel as defined in claim 1 wherein the grinding ratio at intermediate power levels of the wheel driving motor is higher than the grinding ratio of the same wheel containing only abrasive (1) or abrasive (2) as the abrasive grit.
References Cited (Backward Citations)
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Cited
US4543107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |